Attachment for machine-tools.



H. L. JEPFERY & A. E. SGHUGHERT.

ATTACHMENT FOR MACHINE TOOLS.

APPLICATION FILED AUG. 29, 1913.

1,1 10,389. Patented Sept. 15,1914.

5 SHEETS-SHEER 1.

Wliinfiggs w W HIE NORRIS PETER:- ta. PHOTG-LITHQ. WASHINGTON, u. (7,

H. L. JEFPERY,& A. E. SGHUGHERT.

ATTAGHMENT FOR MACHINE TOOLS.

APPLICATION FILED AUG. 29, 1913.

1,1 10,389, Patented Sept. 15,1914.

5 SHEETS-SHEET 2.

to 7'8 W2 tnesses: I At or ey THE NORRIS PETERS CO. PHOTO LITHOWASHINGTON. D. C.

H. L. JEFFERY & A. B. SCHUGHERT.

ATTACHMENT FOR MACHINE TOOLS.

APPLIGATION FILED AUG. 29. 1913.

Patented Sept. 15, 1914..

5 SHEETSSHEET 3.

H. L. JEFFERY & A. E. SGHUGHERT.

ATTACHMENT FOR MACHINE TOOLS.

APPLICATION rum 116.29, 1913.

1,110,389, I Patented Sept. 15,1914.

5 SHEETS-SHEET 4.

Fig. 9

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ATTACHMENT FOB. MACHINE TOOLS.

, APPLICATION I ILBD AUG. 29, 1913.

Patented Sept. 15,1914.

5 SHEETS-SHEET 5.

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' lw/zuentors Witnesses:

HINGmN. u. C.

UNITED STATES PATENT OFFICE.

HAROLD L. JEFFERY, OF FORT THOMAS, KENTUCKY, AND ALBERT E. SCHUCHERT, OFNORWOOD, OHIO.

ATTACHMENT FOR MACHINE-TOOLS.

Specification of Letters Patent.

Patented Sept. 15, 191;.

Application filed August 29, 1913. Serial No. 787,307.

To all whom it may concern Be it known that we, HAROLD L. J EFFERY andALBERT E. Sonuormnr, citizens of the United States, residing at FortThomas, in the county of Campbell and State of Kentucky, and at Norwood,in the county of Hamilton and State of Ohio, respectively, have inventedcertain new and useful Improvements in Attachments for Machine- Tools,of which the following is a specification.

Our invention relates to attachments for metal-working machines, theobject being to provide a means for performing milling work and the likewithout involving the expense of providing a milling machine expresslyfor such work.

Another object is to provide an indexing device for grinding, drillingand milling machines.

Our invention consists in the parts and in the details of constructionand arrangement of parts as will hereinafter be more fully described andclaimed.

In the drawings: Figure 1 is an elevation from the work side of theattachment, only part of the indexing device being included in the view.Fig. 2 is a bottom plan view of the sub-base. Fig. 3 is a plan View ofthe device as shown in Fig. 1, but with the sub-base omitted. Fig. 4 isa horizontal cross section on the line a2-m of Fig. 1, showing how thelive center is held in the work spindle. Fig. 5 is a sectional detail ofa collet suitable for use in the work spindle. Fig. 6 is an elevationfrom the tail end of the device with the complete indexing device shown.Fig. 7 is a bottom plan View of the expanding bushing that carries theattachment in the sub-base. Fig. 8 is a vertical section on the line y-yof Fig. 1, but including the complete indexing device. Fig. 9 is anelevation of the subbase proper from the workmans side of theattachment. Fig. 10 is a sectional detail of the tapered plug for theexpanding bushing in Fig. 7. Fig. 11 is an elevation from the head endof the attachment, with the complete indexing device shown, but with thesub-base omitted and the attachment in position in the tool block of alathe. Fig. 12 is a detail of a chuck suitable for use in theattachment.

The nucleus of the attachment consists in a block or bracket 1 with alower horizontal face 2 having a tongue 3 transversely of it, whichtongue is adapted to fit into a corresponding groove or key-way in thesurface upon which the attachment is to be mounted, as will be laterdescribed. Another face of this bracket 1 has a vertical guide-way 4receiving a vertical :slide 5. This vertical slide has the gib'6 in theguide-way, of long and moderate taper, which gib is provided with anadjusting screw 7 so that the vertical slide can be adjusted securely inthe guide-way at any point. Above the bracket 1 the vertical slide 5 hasa lug 8 extending over with a vertical screw 9 journaled in said lug andheld against vertical movement with relation to the lug and the verticalslide. This screw 9 is threaded into alug 10 which the bracket 1 has onits interior close to the vertical slide 5. S the screw 9 has thecounter-balance crank handle 11 for turning the screw.

Above the lug The outer face of the vertical slide 5 has a cylindricalboss 12 and a swiveling plate 13 has a corresponding cylindrical recessby which it journals on the boss 12. A cap screw 1-1 concentric withsaid ournal holds the swiveling plate 13in position and may be loosenedfor rotating the swiveling plate, but tightened to clamp the plate inany ad justed position. A part of the periphery of the swiveling plate13 is provided with a segment 15 in the form of a worm gear, and a worm16 is journaled horizontally on a pin 18 in a hood 17 projecting outwardfrom the vertical slide above the swiveling plate 13. This pin 18 has asquared projection 19 at one side of the hood to which a wrench may beapplied for turning the worm 16. v

Below its journal bearing, the swiveling plate 13 has lateral outwardand downward screws 22 and 23 the work spindle is held firmlystationary. As may be best seen in Fig. 4, this work spindle 24 has thecollar 25 at one end integral with the spindle, and

at the other end a screw collar 26 and locking collar 27 are provided sothat end play may be eliminated.

Between the two projections 20 and 21 the work spindle 24 is providedwith a worm gear 28 keyed thereon. Below and somewhat outside thevertical center line of the work spindle, the projections 20 and 21receive a transverse pin 29 upon which the indexing worm bracket 30 ispivoted. This bracket 30 extends upward and somewhat outward past theworm gear 28 on the work spindle and has an indexing spindle 31journaled longitudinally in it with a worm 32 keyed on said spindleand'meshing with the worm gear 28 on the work spindle. Above the wormgear 28, extending inwardly, the bracket 30 hasa lug 33 coming betweenlugs 34 and3'5 on the upper parts of the projections 20 and 21,respectively. These lugs 34 and 35 have concentric journal bearings, butthe lug 33 has an opening through it in the form of a slightly elongatedslot with semi-circular ends. A transverse pin 36 is journaled in thelugs 34 and 35 with an eccentric part bearing in the slot of the lug 33.This pin has a squared projection 37 outside the lug 34 and its otherend has a lock nut 38. By turning this eccentric pin 36 by means of awrench applied to the projection 37 the indexing worm bracket may bedrawn toward the work spindle worm gear or forced away from it, thustaking up any wear that may occur.

The upper end of the indexing spindle 31 has an arm 39 extendingradially outward over an index disk or plate 40 secured on the indexingworm bracket 30. -A sector arm 41 also turns concentric with the spindle31 and a set screw 42in the upper end of the spindle 31 clamps the arm39 in the spindle 31. The outer part of the arm 39 has the springpressed plunger 43 which may enter any one of the series of holes inthe-index ing plate 40.

Just outside the indexing worm bracket 30, a bar 44 extends across andis clamped in the two projections 20 and 21 by means of caps 45 and 46clamped on to the upper sides of said projections by cap screws 47 and48. This bar 44 extends some distance past the projection 21, in theposition illustrated, and then bends inward across the center line ofthe work spindle where it carries the dead center 49 with its pointconcentric with the work spindle. As best shown in Figs. 3 to 6, thisdead center has, where it projects outside its bearings in the curved-inpart of the bar 44, a lateral slot in which the annular flange 50 of ascrew 51 engages. This screw 51 is parallel with the dead center 49 andwhen the screw is screw- .51 hasa hand wheel 52.

ed inward or outward in the bar 44 it moves the dead centercorrespondingly. The screw The part of the arm 44 forming the bearingfor the dead center is split for some distance downward from the bearingregion, and a cap screw 53 passes transversely across the split part, sothat if this screw is loosened the dead center 49 will be free forlongitudinal adjustment by the screw 51, or when the screw 53 istightened the dead center will be held firmly in its adjusted position.

4 Again referring to Fig. 4, the work spindle 24 is hollow, and, at theend having the integral collar 25, has an outwardly increasing taper onits hollow interior which will receive a corresponding external taper onsuch a part as it is desired to carry in the work spindle. In Fig. 4 themandrel 54 is shown in position in the work spindle, having the livecenter, and having, just outside the end of the work spindle, a radiallyslotted upward extension 55, as seenin Fig. 6. This slotted extensionserves the purpose of a face plate for engaging with a dog or otherclamping means to hold work between the centers. One side of thisextension 55 has a threaded transverse opening 56 which may receive aclamp screw, if such be needed. This mandrel 54 has the tapered part tofit into the interior taper of the work spindle, and, past that, iscylindrical, extending about half the length of the work spindle. Nearits inner end it is threaded and a sleeve 57 has threads receiving thethreads of the mandrel 54, this sleeve fitting closely in the interiorof the work spindle which is somewhat enlarged to receive it in thisregion. This sleeve extends outside the other end of the work spindlewhere it takes the form of a hexagonal nut 58 to which a- Wrench may beapplied for turning it, thereby drawing the mandrel 54 inward by theaction of the threaded connection between the mandrel and the sleeve, sothat said mandrel is tightly clamped in the tapered part of the interiorof the work spindle. To reinforce this clamping engagement, the wall ofthe work spindle has a small set screw 59 passing through it andengaging in a shallow key-way 60 of the mandrel, the outer surface ofthe work spindle being countersunk to take in the head of the screw 59,and preferably being located just at the inner end of the key-way forthe worm gear 28 that is keyed on the work spindle.

Where it is desired to hold a plain cylindrical mandrel in the workspindle, a collet 61 similar to that shown in Fig. 5, may be substitutedfor the mandrel 54, or, for holding stock of different diameters toextend through the work spindle, different collets may be used. A viseor chuck, like the chuck 61 in Fig. 12, may be held in the work spindlein the same manner as the I mandrel 54 or collet 61, or a vise or chuckwith an ordinary straight shank may be held by'means of a collet asdescribed.

The workspindle may be readily removed entirely and a vise with a roundshank inserted in its place, if it is desired to do milling workrequiring this kind of a hold: er, and not requiring all the adjustmentspossible when using the work spindle.

Another very important possibility due to our invention is the reversalof the work spindle 24, bringing the tapered end around on the otherside of its bearings in the swiveling plate 13, to allowwork to be doneclose up to the chuck or spindle of the lathe, where the tools used orthe natureor thework demandsthis and in connection with which anindexing head is required. Thus, all that is necessary is to remove thescrew collar 26 and locking collar 27, withdraw the work spindle 24 fromits bearings in the swiveling plate 13. and from the worm gear 28,aspermitted by the keywayin the work spindle extending clear tothethreaded end thereof, and then reversing the work spindle andinserting it theother way in the bearings, with its keyway againreceiving the key of the worm gear, bringing the integral collar 25 upagainst the side of the bearing which before received the screw collar26, and thenscrewing the screw collar 26 and locking collar 27 on thethreaded end of the work spindle, to bear against the other side of thebearing where the integrail collar 25 was before. It will thus be seenthat the worm gear making the operative connection with the indexingmeans will not have its position changed, but its key will simply bearin the keyway of the work spindle at a different location therealong,and the operation ofthe entire device will be the same as with the workspindle in its previously described position, and allow all of the otheradjustments of the work spindle, as before.

The screw 9 may have graduationsv 62, similar to those of a micrometercollar, to gage the vertical adustment of the slide 5; and the swivelingplate 13 may have graduations 63, to gage its angular adjustment.

The sub-base, shown in detail in Fig. 9, is a block with three verticalsides 64, and 66 meeting at right angles, with a median interiorhorizontal web67 joining all of the sides. The fourth side of thisblockis substantially open, but a cylindrical hub 68, seen in Fig. 2, extendsabove and below the web 67 and is located substantially tangent to theexposed edge of the web 67 on the open side of the block. The lowerpartof this hub 68 has an extension 69 out from the open side of the blockwith a vertical bolt-opening 70 through it. The lower edges of the sides64, 65 and 66 and the lower side of the hub 68 and of its extension 69are. all finished in a single plane. This bottom side of the block andthe three vertical sides constitute four accurately finished planefaces. Threeother vertical bolt openings 71, 72 .and 73 are located atequal intervals around the hub-68, with relation with the bolt opening.7 0. These latter three bolt openings pass through the vertical sides64, 65 and'66 and adjacent enlargements 74, 75 and 76, providedinteriorly of these. sides adjacent to the hub 68.. These sides andtheir corresponding enlargements are recessed at the upper terminationof the bolt openings.

The hub 68 does not extend up as high as the upper edges of-the threesides of the block, but is finished on its upper face and it has acylindrical bore 77 down from this finished upper face to near its lowertermie nation in the bottom of the hub, where the bore is somewhatenlarged, forming a shoulder 78. Within this cylindrical bore 77, asplit bushing 79 is journaled, having an upper head 80, the lower faceof which bears onthe upper face of the hub 68. The lower end of thesplit bushing 79 is somewhat reduced and'is threaded, and receives asplit threaded collar 81 whichmay be drawn up against the shoulder 78 ofthe rub 68.

The split bushing7 9 has its interior taper increasing from top tobottom, and a corresponding tapered plug 82 fits therein. This plug-82has a T-slot 83 passing transverselythrough its upper part and open onits upper end, and a bolt 84 has .a head 85 fitting into the T-slot 83and with such a bearing against the tapered plug 82 that the bolt maypush the plug downward. or pull it upward in the tapered interior ofthesplit bushing 79. This bolt fits into and is guided by a'verticalbore 86 in the bracket 1 of the attachment somewhat to the rear of thevertical screw 9 of the attachment. Near the upper end of the bracket 1.this bracket has a transverse slot 87 cutting through the bore 86 andthe bar is reducedin the part of the bracket above the slot .87; Theupper end of the bolt 84 is reduced and threaded and passes across theslot 87 andoccupies the reduced part of the bore 86 abovethe slot. Anut-88 is screw-ed on to this threaded part of the bolt and occupies theslot 87 fitting therein so as tobe held against upward or downwardmovement, so that when, it is turned it will move the bolt 84 up or downand move, the plug 82 accordingly. The tongue 3 of the bracket 1, beforementioned, here fits into a groove or key-way 89 across the upper faceof the head 80 of the split bushing 79, the tongue and groove fittingaccurately so that when the bracket 1 is secured-on the sp'lit'bushingby means of lateral cap screws 90 and 91 passing through slots 92 and 93in the'lower part of the bracket 1 and screwed into the head 80, the

bracket will be firmly held against turning with relation to the head.Furthermore, when the tapered plug 82 is drawn up, expanding the bushing79 out against the walls of the bore 77 of the hub in the sub-base 63,said split bushing 79, and with it the bracket 1 and all of the otherparts which said bracket carries, will be held against turning withrelationto the sub-base. For angular adjustment of the attachment on thesubbase in a horizontal plane, the nut 88 is turned, pushing the taperedlug 82 downward, releasing the bushing 79 from the bore .77 and allowingthe entire fixture to swivel on the sub-base 63.

The three vertical'faces 64, 65 and 66 of the sub-base have vertical andhorizontal key-ways 94 and 95, 96 and 97, 98 and 99,

' respectively, and the bottom face has transverse and longitudinalkey-ways 100 and 101, respectively. These key-ways may receive keysfitting into corresponding key ways of the beds or tables of variousmachines upon which it may be desired to use the attachment, such asdrill presses, shapers, milling machines or grinders. or thus mountingthe sub-base on the table of a machine with one of its vertical sidesagainst the table, a C-clamp may be conveniently used, engaginginteriorly of the side of the sub-base, as is permittedby having theupper and lower sides of the subbase open and binding it transversely bythe horizontal median web 67 beforedescribed. Where the sub-base is tobe clamped to a machine with its bottom side against the table of themachine, the bolt openings may be utilized.

' Where the attachment is to be used on a lathe, the bracket 1 isremoved from the head 80 in the sub-base, and the cap screws 90' and 91are used to attach to the bracket to a yoke piece 102 fitting into theT-slot 103 of the tool block 1040f the lathe, from which the tool posthas been removed. In removing the bracket 1 from the sub-base, the nut87 Was also removed and the bolt remained with the sub-base.

The spindle of a lathe is generally very substantial and constructedlike a milling machine spindle, with threadednose and tapered hole toreceive milling cutters, arbors, and end mills. Thus, bythe provision.of our invention to hold the work in any desired position with respectto such cutting tools carried by the lathe, work that would ordinarilyrequire a milling machine may be performed at short notice by simplyapplying our invention to the lathe.

The cross slide of the lathe is used for all motions and adjustmentsnecessary at right angles to the lathe spindle, and the attachmentitself provides all required vertical motions. The longitudinal slide ofthe lathe is used for locating the work in relation to the cutter andalso for feeding the work parallel to the cutter axis. The attachmentitself provides all required angular adjustments in vertical planes,and, if angular adjustment in a horizontal plane is required, thecompound slide or rest of the lathe may be used for a horizontal swivelinstead of the sub-base, which is intended for use with before dearepossible; Further, since the indexing device is located intermediate ofthe ends of the work spindle and not at one end thereof, the workspindle may be taken out of the projections 20 and 21, the indexing wormgear 28 being removed, and replaced therein in reverse position withsaid worm gear replaced .thereon, thus presenting the work on the otherside of the attachment, as may be required in connection with themachine the attachment is used upon. All of the adjustments are providedwith manipulative means permitting great precision in the adjustment,while the locking means for each adjustment insures that the preciseadjustment will be maintained throughout the operation. This is alsotrue of the straight-line adjustment of the vertical slide 5 in thebracket 1 with its vertical screw 9 and gib 6.

The attachment and its sub-base may be transferred with its work fromone machine to another and all the different operations performedwithout resetting, with the attendant inaccuracies usually involvedwhere only the work is transferred from one machine to the other for thesuccessive operations. Where necessary, an angle plate may be used forsetting the sub-base of the attachment'upon a machine bed or table, thesub-base being readily secured to such angle plate by the meansdescribed.

The attachment is not only intended to be used on lathes, drill presses,shapers or grinders, and like machines; but maybe used as well on amilling machine in the same manner as an ordinary indexing head would beused on such a machine, and more advantageously, owing to the novelarrangement of the indexing means of this attachment. In case adjustingbar His too short a suitable tail stock may .be used. Combined with thelathe, many operations heretofore possible only with the use of themilling machine are possible upon the lathe.

lVhile we have illustrated and described specifically an example ofconstruction of our invention, it will be understood that we are notlimited to such specific illustrations and description, except asdefined by the following claims: a

1. In a device of the character described, a work spindle, meanscomprising separate journals for the work spindle, adjusting means fixedon the work spindle between the journals, and means limiting the workspindle against end play in its journals but removable to allow the workspindle to be reversed insaid journals and in its fixed relation withsaid adjusting means.

2. In a device of the character described, a work spindle, meanscomprlsmg separate journals for the work spindle, adjusting meansadapted to be fixed on the work spindle in different locationstherealong and lo cated between the journals of the work spindle, andmeans on said work spindle for limiting end play thereof, one of themeans being removable to allow the work spindle to be reversed endwisein its'bearings and in its fixed relation with said adjusting means. I

3. In a device of the character described, a work spindle, meanscomprising separate journals for the work spindle, a worm gear fixed onthe work spindle concentric-with it between said journals for adjustingsaid work spindle angularly and capable of being fixed on said workspindle at different locations therealong, and means on said workspindle bearing against opposite sides of,

the means comprising the journals to limit end play of the work spindlein itsjournals, one of said means being removable and allowingwithdrawal of the work spindle from its journals and from the worm gearbetween the journals, whereby the work spindle may be reversed endwisein its journals and its fixed relationewith said worm wheel.

4:. In a device ofthe character described, a work spmdle, means formounting sald spindle on a machine whereby sald spindle is angularlyadjustable around its axis,

for holding work in said spindle, an arm parallel to the axis of saidspindle having a projection across said axis, means permittingadjustment of said arm parallel to said axis, a center carried insaidprojection conof the work spindle, said supporting means for saidbracket having a plurality of plane faces each capable of attachment toa correspondingly faced machine apart, a y

' 7. In a device of the character described, a bracket, a work spindleadjustably carried thereby, supporting means for said bracket, and meansfor angularly adjusting said bracket thereon, said supporting means forsaid bracket having a plurality of plane faces each capable ofattachment to a correspondingly faced machine part.

8. In a device of the character described, a bracket, a work spindleadjustably carried thereby, supporting means for said bracket, and meansfor-angularly adjusting said bracket thereon, said supporting meanshaving a p'lanefa'c'e opposite to themountingof said bracket on saidsupportingmeans and parallel with the, plane of angular adjustment ofsaid bracket, having two other plane faces at right angles to the firstface and opposite to each other, and having a fourth plane face atrightangles to said two faces and to the first face, each of'the fourplane faces being adapted for attachment to a correspondingly facedmachine 3art.- I

1 9. In a deviceof the character described, a bracket having faces atright angles to each other, one of the faces having a guideway extendingacross it at right angles to the plane of the first face, a slidemounted it against turning on its journal bearing, a

segment in the form of a worm gear on said plate concentric with. thejournal bearing of the plate, a worm journa-led on said slide and inmesh with said segment,a screw engaging with 'said'bracket and with saidslide to move theslide in the guide-way, a

work spindle carried by said plate, means for holding work in said workspindle, and means for angularly adjusting said work spindle arounditsaxis.

10. In a device of the character described, a bracket having faces atright angles to each other, one of the faces being adapted to cooperatewith other parts for mounting the device on a machine, and the otherface having a guide-way extending across it at right angles to the planeof the first face, a slide mounted in said guideway, a substantiallycylindrical boss on said slide, a plate having a recess fitted on saidboss whereby the plate is journaled on the slide, a screw passingthrough said plate and threaded into said slide and engaging againstsaid plate to hold it against turnmg on its journal bearing, a segmentin the form of a worm gear on said plate concen tric with the journalbearing of the plate, a worm ournaled in said slide and 1n mesh withsaid segment, a screw engaging with,

said bracket and with said slide to move the slide in the guidewvay,awork spindle carried by sald plate, means for holding work in said workspindle, and means for angularly adjusting said work spindle around itsaxis.

11. In the device of the character described, a bracket having faces atright angles to each other, one of the faces having a tongue extendingacross it, and the other face having means for adj ustably mounting theWork spindle on it, a head having aface to engage with the face of thebracket that has the tongue, and having a groove into which said tongue,fits, said bracket having an opening through it at right angles to thesefaces, and said head having means with an opening through it with ataper increasing in diameter downward from said face, said means beingsplit for expansion, a tapered plug fitting in the taper of the opening,means engaging with said plug and extend ing up into the opening in thebracket, means engaging with the bracket and with the means that engageswith the plug for moving said plug up or down, and a sub-base memberhaving an opening receiving the split means of said head within whichsaid means may engage when expanded, to lock the bracket stationary onsaid sub-base memher, said means being adapted to turn in the opening ofthe sub-base member to allow said bracket to be angularly adjusted onsaid o enin throu h it with a ta er increasing in diameter downward fromsaid face, said means being split for expansion, a tapered plug fittingin the taper of the opening, means engaging with said plug and extendingup into the opening in the bracket, means engaging with the bracket andwith the means that engages with the plug for moving said plug up ordown, a sub-base member having an opening receiving the split means ofsaid head within which said means may engage whenexpanded to lock thebracket stationary on said sub-base member, said means being adapted toturn in the opening of the sub-base member to allow said bracket to beangularly adjusted on said member when the means is not locked by suchexpansion, said sub-base member having a plurality of differentlydirected plane faces each capable of attachment to a correspondinglyfaced machine part.

13. In a device of the character described, a work spindle, a platehaving projections forming journals for the work spindle, a worm gearfixed on the work spindle concentric with it, between said projections,a worm bracket pivotally mounted between said projections to swing in aplaneat right angles to the axis of the work spindle, and a worm journaled in said worm bracket and meshing with said worm gear.

14. In a device of the character described,

a work spindle, a plate having projections forming journals for the workspindle, a worm gear fixed on the work spindle concentric with it,between said projections, a worm bracket pivotally mounted between saidprojections to swing in a plane at right angles to the axis of the workspindle, a worm journaled in said worm bracket and meshing with saidworm gear, and means for swinging said bracket toward or away from saidworm gear;

15. In a device of the character described, a work spindle, a platehaving projections forming journals for the work spindle, a

worm gear fixed on thework spindle concentric with it, between saidprojections, a worm bracket pivotally mounted between said projectionsto swing in a plane at right angles to the axis of the work. spindle, aworm j ournaled in said Worm bracket and meshing with said worm gear,juxtaposed lugs on the respective projections,'a pin journaled in saidlugs and having the part between the lugs concentric to its journals,and a lug on said worm bracket having a slot within which said eccentricpart of the pin engages, wherebyturning said pin in one direction or theother swings said worm bracket and the worm carried thereby away fromsaid worm gear or swings said bracket toward said worm gear and adjuststhe worm with respect'to the worm gear. 7

16. In a device of the character described, a work spindle, a platehaving projections forming journals for the work spindle, a worm gearfixed on the work spindle concentric with it, between said projections,a worm bracket pivotally mounted between said projections to swing in aplane at right angles to the axis of the work spindle, a worm journaledin said worm bracket and 10 meshing with said worm gear, a spindle forsaid Worm extending up from the worm bracket, an index plate on the wormbracket around the spindle, and an arm with which the spindle turns, andmeans on said arm for engaging with said index plate.

HAROLD L. JEFFERY. ALBERT E. SCHUCHERT. \Vitnesses:

JAMES N. RAMSEY, CLARENCE PERDEW.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). C.

